Alright, let's work through 78439187 times 48928747 step by step
78439187 × 48928747 = 48928747 × (78439187)
+ 48928747 × 7 that results in 342501229
+ 48928747 × 80 that is equal 3914299760
+ 48928747 × 100 that is equal 4892874700
+ 48928747 × 9000 that equals 440358723000
+ 48928747 × 30000 producing 1467862410000
+ 48928747 × 400000 that results in 19571498800000
+ 48928747 × 8000000 that is equal 391429976000000
+ 48928747 × 70000000 giving us 3425012290000000

= 3837931135608689
